What is the circumference of this circle equal to?

C = 2(pi)r = (pi)d

What is the area of this circle?

A = (pi) r²

Find the area of this circle.

A = (pi)*36

Find the circumference of this circle.

C = 12(pi)

What is the arc measure, in degrees?

a^o

What is the arc length?

arc length = ^a/₃₆₀ (2)(pi)r = ^a/₃₆₀ (pi)d

If AB = 12 and BC = 5, what equation can you use to find the diameter, d?

5² + 12² = d²

What is the correct equation to find x, if x is the length of AC?

5² + 8² = x²

What is the arc measure of the intercepted arc?

2x^o

What is the measure of <a?

a = ¹/₂ (y - x)

Find x.

x = 60^o

Find x.

x = ¹/₂ (80 - 20) = ¹/₂ (60) = 30

What is the correct equation to solve for a?

12a = 8(10)

What is the correct equation to solve for x ?

18(x + 18) = 16(16 + 24)

What is the equation for this circle?

(x - h)² + (y - k)² = r²

What is the equation for this circle?

(x - 4)² + (y + 2)² = 16